set(EMSCRIPTEN_PREFIX "${PROJECT_SOURCE_DIR}/emscripten/emsdk/emscripten/1.38.28/")
set(_WEBAPPLICATION_HTML "${PROJECT_SOURCE_DIR}/platforms/web/Application.html")
set(MAGNUM_EMSCRIPTENAPPLICATION_JS "${PROJECT_SOURCE_DIR}/platforms/web/EmscriptenApplication.js")
set(MAGNUM_WINDOWLESSEMSCRIPTENAPPLICATION_JS ${MAGNUM_EMSCRIPTENAPPLICATION_JS})
set(MAGNUM_WEBAPPLICATION_CSS "${PROJECT_SOURCE_DIR}/platforms/web/WebApplication.css")
set(_DEPLOY_DIR "${PROJECT_SOURCE_DIR}/deploy/")


set(CMAKE_SYSTEM_NAME Emscripten)

# Help CMake find the platform file
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_LIST_DIR}/../modules)

if(NOT EMSCRIPTEN_PREFIX)
    if(DEFINED ENV{EMSCRIPTEN})
        file(TO_CMAKE_PATH "$ENV{EMSCRIPTEN}" EMSCRIPTEN_PREFIX)
    else()
        set(EMSCRIPTEN_PREFIX "/usr/lib/emscripten")
    endif()
endif()

set(EMSCRIPTEN_TOOLCHAIN_PATH "${EMSCRIPTEN_PREFIX}/system")

if(CMAKE_HOST_WIN32)
    set(EMCC_SUFFIX ".bat")
else()
    set(EMCC_SUFFIX "")
endif()
set(CMAKE_C_COMPILER "${EMSCRIPTEN_PREFIX}/emcc${EMCC_SUFFIX}")
set(CMAKE_CXX_COMPILER "${EMSCRIPTEN_PREFIX}/em++${EMCC_SUFFIX}")
set(CMAKE_AR "${EMSCRIPTEN_PREFIX}/emar${EMCC_SUFFIX}" CACHE FILEPATH "Emscripten ar")
set(CMAKE_RANLIB "${EMSCRIPTEN_PREFIX}/emranlib${EMCC_SUFFIX}" CACHE FILEPATH "Emscripten ranlib")

set(CMAKE_FIND_ROOT_PATH ${CMAKE_FIND_ROOT_PATH}
    "${EMSCRIPTEN_TOOLCHAIN_PATH}"
    "${EMSCRIPTEN_PREFIX}")

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

# Otherwise FindCorrade fails to find _CORRADE_MODULE_DIR. Why the heck is this
# not implicit is beyond me.
set(CMAKE_SYSTEM_PREFIX_PATH ${CMAKE_FIND_ROOT_PATH})

# Since some unspecified release, -s WASM=1 is the default, so we need to
# explicitly say -s WASM=0 to use asm.js. The *_INIT variables are available
# since CMake 3.7, so it won't work in earlier versions. Sorry.
cmake_minimum_required(VERSION 3.7)
set(CMAKE_CXX_FLAGS_INIT "-s WASM=0")
set(CMAKE_EXE_LINKER_FLAGS_INIT "-s WASM=0")
set(CMAKE_CXX_FLAGS_RELEASE_INIT "-DNDEBUG -O3")
set(CMAKE_EXE_LINKER_FLAGS_RELEASE_INIT "-O3 --llvm-lto 1")

find_package(MagnumIntegration REQUIRED ImGui)
set(CORRADE_TARGET_EMSCRIPTEN 1)
find_package(Magnum REQUIRED GL Sdl2Application)


#set(CMAKE_TOOLCHAIN_FILE "${PROJECT_SOURCE_DIR}/toolchains/generic/Emscripten.cmake")
#set(CMAKE_INSTALL_PREFIX "${EMSCRIPTEN_PREFIX}/system/")
#set(CMAKE_PREFIX_PATH "${EMSCRIPTEN_PREFIX}/system/")

set_directory_properties(PROPERTIES CORRADE_USE_PEDANTIC_FLAGS ON)


add_executable(MyApplication main.cpp)
target_link_libraries(MyApplication PRIVATE
    Magnum::Application
    Magnum::GL
    MagnumIntegration::ImGui)

if(CORRADE_TARGET_EMSCRIPTEN)
    install(TARGETS MyApplication DESTINATION ${_DEPLOY_DIR})
    install(FILES
        ${_WEBAPPLICATION_HTML}
        ${_EMSCRIPTENAPPLICATION_JS}
        ${_WEBAPPLICATION_CSS}
        DESTINATION ${_DEPLOY_DIR})
endif()